[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 51.626556][ T26] audit: type=1800 audit(1562254698.386:25): pid=8280 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 51.671064][ T26] audit: type=1800 audit(1562254698.386:26): pid=8280 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 51.715096][ T26] audit: type=1800 audit(1562254698.386:27): pid=8280 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.117' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.621352][ T8432] ------------[ cut here ]------------ [ 59.627174][ T8432] verifier backtracking bug [ 59.627273][ T8432] WARNING: CPU: 1 PID: 8432 at kernel/bpf/verifier.c:1785 __mark_chain_precision+0x19bb/0x1ee0 [ 59.642946][ T8432] Kernel panic - not syncing: panic_on_warn set ... [ 59.650863][ T8432] CPU: 1 PID: 8432 Comm: syz-executor314 Not tainted 5.2.0-rc5+ #34 [ 59.661622][ T8432] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.673895][ T8432] Call Trace: [ 59.677204][ T8432] dump_stack+0x172/0x1f0 [ 59.682245][ T8432] ? __mark_chain_precision+0x1970/0x1ee0 [ 59.689045][ T8432] panic+0x2cb/0x744 [ 59.693192][ T8432] ? __warn_printk+0xf3/0xf3 [ 59.698305][ T8432] ? __mark_chain_precision+0x19bb/0x1ee0 [ 59.704214][ T8432] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.711667][ T8432] ? __warn.cold+0x5/0x4d [ 59.716285][ T8432] ? __warn+0xe8/0x1d0 [ 59.720614][ T8432] ? __mark_chain_precision+0x19bb/0x1ee0 [ 59.726358][ T8432] __warn.cold+0x20/0x4d [ 59.731348][ T8432] ? vprintk_emit+0x1ea/0x700 [ 59.736735][ T8432] ? __mark_chain_precision+0x19bb/0x1ee0 [ 59.743249][ T8432] report_bug+0x263/0x2b0 [ 59.748101][ T8432] do_error_trap+0x11b/0x200 [ 59.752880][ T8432] do_invalid_op+0x37/0x50 [ 59.757815][ T8432] ? __mark_chain_precision+0x19bb/0x1ee0 [ 59.763703][ T8432] invalid_op+0x14/0x20 [ 59.768166][ T8432] RIP: 0010:__mark_chain_precision+0x19bb/0x1ee0 [ 59.775262][ T8432] Code: 08 31 ff 89 de e8 95 ba f2 ff 84 db 0f 85 ce fe ff ff e8 48 b9 f2 ff 48 c7 c7 e0 44 91 87 c6 05 1c 15 1f 08 01 e8 03 f1 c4 ff <0f> 0b 41 bc f2 ff ff ff e9 af fe ff ff e8 d3 3c 2c 00 e9 c2 e7 ff [ 59.796571][ T8432] RSP: 0018:ffff88809f4e7380 EFLAGS: 00010286 [ 59.803426][ T8432] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 59.813679][ T8432] RDX: 0000000000000000 RSI: ffffffff815ad926 RDI: ffffed1013e9ce62 [ 59.827607][ T8432] RBP: ffff88809f4e74d0 R08: ffff888092a5a0c0 R09: 0000000000000000 [ 59.836241][ T8432] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 59.844392][ T8432] R13: ffff88809b35b600 R14: 0000000000000001 R15: ffff888093bace40 [ 59.852675][ T8432] ? vprintk_func+0x86/0x189 [ 59.857278][ T8432] ? print_verifier_state+0x11b0/0x11b0 [ 59.863071][ T8432] ? __x64_sys_bpf+0x73/0xb0 [ 59.867643][ T8432] ? bpf_verifier_log_write+0x240/0x240 [ 59.873186][ T8432] ? check_reg_arg+0x1f1/0x480 [ 59.877933][ T8432] ? apparmor_capable+0x2ed/0x630 [ 59.882948][ T8432] check_cond_jmp_op+0xcd8/0x3c30 [ 59.887953][ T8432] ? fs_reclaim_acquire.part.0+0x30/0x30 [ 59.893569][ T8432] ? find_held_lock+0x35/0x130 [ 59.898312][ T8432] ? fs_reclaim_acquire.part.0+0x30/0x30 [ 59.904034][ T8432] ? check_func_arg+0x11c0/0x11c0 [ 59.909044][ T8432] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.915608][ T8432] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.921846][ T8432] ? krealloc+0x7b/0xd0 [ 59.925981][ T8432] ? krealloc+0x7b/0xd0 [ 59.930141][ T8432] ? rcu_read_lock_sched_held+0x110/0x130 [ 59.935845][ T8432] ? kfree+0x1f7/0x220 [ 59.939917][ T8432] ? krealloc+0x7b/0xd0 [ 59.944059][ T8432] ? push_jmp_history.isra.0+0x1a9/0x260 [ 59.949668][ T8432] do_check+0x60f4/0x8a20 [ 59.953975][ T8432] ? debug_check_no_obj_freed+0x200/0x464 [ 59.959684][ T8432] ? check_helper_call+0x3210/0x3210 [ 59.965047][ T8432] ? kfree+0x170/0x220 [ 59.969093][ T8432] ? kvfree+0x61/0x70 [ 59.973062][ T8432] ? kfree+0x170/0x220 [ 59.977111][ T8432] ? lockdep_hardirqs_on+0x418/0x5d0 [ 59.982411][ T8432] ? trace_hardirqs_on+0x67/0x220 [ 59.987415][ T8432] ? kvfree+0x61/0x70 [ 59.991381][ T8432] bpf_check+0x6f99/0x9950 [ 59.995801][ T8432] ? do_check+0x8a20/0x8a20 [ 60.000292][ T8432] ? ktime_get_with_offset+0x13a/0x360 [ 60.005750][ T8432] ? bpf_prog_load+0xdce/0x1670 [ 60.010595][ T8432] ? ktime_get_with_offset+0x13a/0x360 [ 60.016037][ T8432] ? lockdep_hardirqs_on+0x418/0x5d0 [ 60.021320][ T8432] ? trace_hardirqs_on+0x67/0x220 [ 60.026348][ T8432] ? memset+0x32/0x40 [ 60.030334][ T8432] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 60.036611][ T8432] ? bpf_obj_name_cpy+0x13f/0x190 [ 60.041633][ T8432] bpf_prog_load+0xe68/0x1670 [ 60.046295][ T8432] ? bpf_prog_new_fd+0x60/0x60 [ 60.051150][ T8432] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.057367][ T8432] ? security_bpf+0x8b/0xc0 [ 60.061866][ T8432] __do_sys_bpf+0xa20/0x42d0 [ 60.066438][ T8432] ? bpf_prog_load+0x1670/0x1670 [ 60.071353][ T8432] ? __do_page_fault+0x623/0xda0 [ 60.076270][ T8432] ? find_held_lock+0x35/0x130 [ 60.081097][ T8432] ? __do_page_fault+0x623/0xda0 [ 60.086041][ T8432] ? lock_downgrade+0x880/0x880 [ 60.090870][ T8432] ? kasan_check_read+0x11/0x20 [ 60.095723][ T8432] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 60.101177][ T8432] ? do_syscall_64+0x26/0x680 [ 60.105834][ T8432] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 60.111880][ T8432] ? do_syscall_64+0x26/0x680 [ 60.116637][ T8432] __x64_sys_bpf+0x73/0xb0 [ 60.121068][ T8432] do_syscall_64+0xfd/0x680 [ 60.125641][ T8432] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 60.131782][ T8432] RIP: 0033:0x440369 [ 60.136802][ T8432] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 60.156479][ T8432] RSP: 002b:00007ffdafa84bf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 60.164886][ T8432] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440369 [ 60.173198][ T8432] RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 [ 60.181338][ T8432] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 60.189395][ T8432] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401bf0 [ 60.198056][ T8432] R13: 0000000000401c80 R14: 0000000000000000 R15: 0000000000000000 [ 60.207273][ T8432] Kernel Offset: disabled [ 60.211650][ T8432] Rebooting in 86400 seconds..